Operator for counterbalanced elevator doors



ug. 16, 1932. R, s, PEELLE 1,872,332

ORERAT-.OR FOR COUNTEBALANCED ELEVATOR DOORS ATroRNY.

Aug. 16, 1932. R. s. PEELLE OPERATOR FOR COUNTERBALANCED ELEVATOR DOORS Filed Dec. 3. 1951 2 Sheets-Sheet 2 421 ATTORNEY.

Patented Aug. is, 1932 UNITED STATES lPATENT orf-NICE ROBERT s. PEELLE, or iioLLIs, NEW Yonx, AssxeNon 'ro 'rua PEELLE' conraNY, or

BROOKLYN, NEW Yonx, a CORPORATION or NEW You ornaa'ron non COUNTERBALANCED ELEvA'roa noons Application led December 3, 1931. Serial No. 578,792.

The 'invention relates to operators for counterbalanced elevator doors and more particularly to a mechanism of this character which embodies therein a key-control actuating device operative to both vprevent the application of opening power to the doors through the operator and the manual open# ing of the doors.

for use, include an electric motor or motors operative upon each door in the shaft. Each door is provided with alocking mechanism which cannot be released unless the elevator car is located at the landing adjacent the door which is to be unlocked. The elevator car is provided with a fixedor receding cam by which the locking mechanism may bereleased'to permit movement of the doors. EX-

- tending vertically throughout the shaft and adjacent all of the doors are electrical mains,

these mains being tapped adjacent each floor' for delivering .power to the elevator door operating motors adjacent that floor, lines from the mains to said door motors having included in their length a normally open switch mechanism adapted to be actuated from a xed or receding cam upon the car so as to prevent the closing of the circuits to the motors at any door unless the elevator car is adjacent that door. The electrical mains extending throughoutI the shaft are normally unconnected with the electrical source by means of what is known as a pent- "ihouse magnetic switch mechanism including two electro-magnetic lswitches by means of which the polarity of the current delivered fill to the door motors may be so controlled as to permit either opening or closing power to be applied to said doors. The actuation of said magnetic switch mechanism is controlled by push buttons in the elevator car itself or upon the floors of a building.

The above construction, briefly explains the general characteristics of the particular construction of operator to be referred to herein, and with this construction of operator, notwithstanding that the sha-ft mains are common to the motors for operating all of the door in the shaft, power from these Operators of the `type in which the inter-4 lock of my invention is particularly adapted mains may be selectivelyapplied to the motors operative as to any door in the shaft,-

as defined by the position of the elevator car. The application of power to such motors, however, is controlled by the manually operative push buttons in the car itself, or, when the operator is applied to automatic elevators, by manually operative push buttons on any floor in the building. By this construction, the shaft mains are'normally dead and remain dead until it -is desired to y apply power to the motors associated with a door for the purpose of opening or closing that door. Hence, in such a door operator, the supply of elpctrical energy is controlled by switches actuated by manually operative push buttons, the application of such energy for applying opening or closing power to any particular `door being dependent upon the car being positioned adjacent the door opening closed by that door. A single switch mechanism controlling the supply of energy to thek shaft mains is lpresent in such an operator, and such energy may be selectively applied to the motors for operating any door in the shaft by ashaft switch mechanism,v

thev actuation of which is controlled by the position of the car, in conjunction with a manually operative switch mechanism colitrolling the supplyl of energy to the shaft mains.

In this manner, as the elevator car travels from floor to door in a shaft, the door lock of each door may be released and yet none of the doors in the shaft will be opened unless Va manually operative switch mechanism is vmanually actuate the push button switch Controlling the penthouseswitch mechanism to ensure the power opening the door.

Counterbalanced elevator doors are used mainly in warehouses, manufacturing loft buildings and in similar locations where elevator service is furnished to manufacturers or business concerns located upon different floors. Access to different floors for the delivery and removal of merchandise may7 be had solely by means of the elevator. nybody having access to the elevator may, when the various door openings are closed either by manually or power operated elevator doors, gain access to any floor or loft of the building.' The operation of the doors at any floor, when such doors are manually 0perated, may be Vprevented by the use of a simple locking mechanism preventing the actuation of the door lock or movement of the door sections.

The main purpose of the invention is to embody-in an operator of the above type, a keycontrolled 'mechanism operative as to the individual doors in a shaft by means of which the occupant of any floor or loft may effectively guard against the openingof the door, first: preventing the separation of the two door sections by the use of a positvely acting latch mechanism; and second, by preventing the application of power to the operator motor or motors at that door so as to preclude possibility of damage to the operator installation or to the door structure.

In securing the above results, I provide the upper doorsection with a latch mechanism, the bolt or latch of which, by engagement with a keeper carried by the guide rail structure, will prevent upward movement of the upper section and downward movement of the lower section of the door. Adjacent the keeper is a normally closed switch mechanism controlling the circuit to the operator motors at that door, this switch mechanism being so constructed that when the bolt on the lock mechanism above referred to is shot, the circuit to said motor or motors will be opened. This switch mechanism is in the branch lines from the shaft mains to the operator motors, so that each door in a shaft may be individually controlled in' the manner above referred to.

The invention consists primarily in an operator for counterbalanced elevator doors, embodying therein an electric motor adjacent a door in ashaft, flexible connections between the door sections, sheaves about which said connections pass, means whereby the power of said motor may be applied to said door sections, a lock for said door sections, a source of power, electrical mains in the shaft adjacent said door, branch lines leading from said mains to said motor, a normall open shaft switch mechanism controlling the circuit from said mains to said motor, means carried by an elevator car and opera-tive upon said shaft switch mechanism, a pole changing switch mechanism whereby Said mains may be connected with `said source, a manually operative control for said pole changing switch mechanism, and a lock switch mechanism comprising normally engaged fixed and movable contacts connected 1n series with said shaft switch mechanism, a keeper plate adjacent said contacts and a key-controlled lock mechanism carried b one of the door sections and including a bo t co-operating with said keeper plate to prevent movement of the door sections and with said lock switch mechanism to interrupt the circuit to said motor independently of said shaft switch mechanism; and in such other novel features of construction and combination of parts as are hereinafter set forth and described and more particularly pointed out in the claims hereto appended.

Referring to the drawin s,

'F ig. l is a view from t e shaft side, vertically and laterally condensed, showing counterbalanced elevator doors embodying the invention at'two door openings;

Fig. Q is a fragmentary portion, on a. larger scale, of one of the doors adjacent the meeting line of the two sections, showing the mechanical door lock, the shaft switch mechanism and the lock switch mechanism, the casing of the latter being broken away;

Fig. 3 is a section on the line 3 3 of Fig. 2;

Fig. 4 is a diagram of the electrical conditions of the operator; and

Fig. 5 is a view from the right of Fig. 2 with portions thereof broken away.

Like numerals refer to like parts throughout the several views.

In the embodiment of the invention shown in the drawings, two counterbalanced doors are shown, each being of the same construction as the other, both as to the details of the doorsections and as to the mechanisms for operating same. The upper door 10 is composed of an upper section 10a and a lower section 10b, and the lower door 11 is composed of an upper section 11a and a lower section 11?). Two doors are shown in order to illustrate the selective operation and control of a plurality of doors in a shaft, each of these doors being identical in structure with the other, both as to the door sections and as to the parts appurtenant to the door.

In the drawings, each door section of each door is composed of an angle metal frame 12 extending entirely about the edge of the door and rojecting inwardly of this edge. Within t 1e opening of the frame is a metal sheathed wooden panel 13 of the usual construction. Carried at the top of the lower door section is what is known as a hanger or truck bar 14, the ends of which project beyond the side edges of the lower door section and across a guide rail structure 15, which is of the usual construction consisting of what is known as a wall angle 16 and a yguide angle 17` co-operating with which are shoes 18 carried by each door section.

Above the lintel of the door opening, adjacent one jamb, is a sheave 19 geared directly to an electric motor 20. A similar sheave 21 is mounted adjacent the jamb and above the lintel at the other side of the door opening, this sheave being geared to an electric motor 22. Passing about the sheaves 19 and 21 are the usual flexible connections or chains 23, one end of each being connected with the lower portion of they upper door section, and the other end to' the hanger or truck bar 14 of the lower door section. The reach of said connections, adjacent the door opening, is connected with the upper door section, and the reach most remote from the door opening is connected with the lower door section.

The sheaves 19 and 21 are oppositely driven by their motors 2O and 22, so that as said sheaves are rotated in one direction, lifting stresses will be applied to said upper door section, and the lower section will be permitted to descend by gravity when opening a door, and when closing a door, lifting stresses will be applied to the lower door section and the upper door section will be peri mitted to' descend by gravity. It will be noted that the lower door section can have no downward movement unless there is an up-` ward movement of the upper door section.

The mechanical locking means for the door consists of a lever 24 carrying a ratchet bar 25 engageable with a ratchet bar 26 upon the bar 14. The lever 24 is provided with an impact roller 27 adapted to be projected inwardly ofthe shaft by means of a spring 28. At 29 I have shown conventionally the usual car cam which may be either a stationary or a receding cam, as desired. The sole difference between these two forms of cams is that as an elevator ascends and descends, if a fixed cam be used, a lockrat the door of each opening will be momentarily released and relocked as the elevator car passes that floor, while with a receding cam, no lock will be released unless the cam actuating mechanism is operated. The above parts are all old and well know in this art and are described merely to identify one type of construction of door to which the invention is applicable. The motors 20 and 22 adjacent each door may have power selectively applied thereto,

the motors to which power is applied at any.

time being determined by the position of an elevator car -in relation thereto. The electrical conditions of the operator, of the invention are illustrated in Fig. 4 in which 30, 31

and 32 indicate the electrical mains from which power is supplied to the elevator shaft mains 33, 34 and 35. These shaft mains extend throughout the entire height of the shaft adjacent all of the doors. Extending from the'main 33 adjacent each floor isa branch line 33aconnecting the motors 20 and 22 at that floor in parallel with each other. Extending from the shaft mains 34 and 35 are branch lines 36 and 37 similarly connect- 41 and two fixed contacts 42 co-operati'ng.

With a. movable bridge contact 43. The normally open shaft switch mechanism- 39 consists of two bridge switches, one'of which has fixed contacts 44m-operating with a movable contact 45 and fixed contacts 46 co-operating with a movable bridge contact 47. The movable'contacts 45 and 47 are carried by a pivotal arm- 48, the lower end of which is i acted uponby the lever 24 forming a part of the mechanical lock in a manner to utilizethe action of the spring 28 to normally disengage said movable contacts 45 and 47 with their co-op'erating fixed contacts 44 Aand 46 at all times Aexcepting when the mechanical lock mechanism is released to permit opening movement of the door. The particular mechanism employed for actuating the normally open switch mechanism 39 is immaterial to the invention so long as the construction is such that the circuit controlled by said` switch mechanism will be. interrupted at all times while the door is mechanically locked, but will be closed simultaneously with release of said mechanical lock mechanism.

The motors 20 and 22 are three-phase alternating current induction motors and are reversible-in the usual manner by changing the polarity of two of the lines supplying power thereto` The shaft mains 33, 34 and 35 are normally dead, the supply of power to amotor being controlled by a pole changing penthouse switch mechanism which will now be described. v

This switch mechanism comprises two electro-magnetic switches 49 and 50, the former of which may be termed an opening switch,

vand the latter of which, a closing switch.

The switch 49 has three fixed contacts 51, 52

by the leads 54, and 56, and three movable contacts 57, 58and 59, normally disengaged from the contacts 51, 52 and 53 by the spring actuated memberI 60. These movable contacts are actuated by means of an armature 61 of an electro-magnet 62. The ciosing and 53 connected with the mains 30, 31 and 32 switch mechanism 50 consists of three fixed contacts 63, 64 and 65 connected directlyA with thevmai'ns 30, 31 and 32, and three movable contacts 66, 67 and 68 normally disengaged `from the contacts 63, 64 and 65 by the ture of an electro-magnet 71, the armature 70 acting upon the member 69.

The supply of current for energizing the magnet 62 is delivered to the winding of said magnet as a result of the actuation of a manually operative control switch 72 which may be located either in an elevator car or in the hall of a building.

A conductor 73 extends from the line 31-55 to the fixed Contact 74 of the switch 72. A second line 75 extends from the fixed Contact 76 of said switch to the winding of the magnet 62. The switch 72 includes a movable bridge contact 77. The circuit is completed through a line 78 extending from the winding of the magnet 62 to the line 32 of the source. It is desirable, and sometimes required, that the construction be such that the car user is required only to apply initial energizingpower to the magnet 62, and that thereafter power be continuouslyT supplied to said magnet until the door has completed, or substantially completed, its full opening movement.

In Fig. 4 one means of securing this result is conventionally illustrated, this means consisting of an electro-magnetic switch supplying power through one of the shaft lines to the winding of the electro-magnet 62, the circuits controlled by the push button switch 72 and by said last named electro-magnetic switch being under the control of what is known as a limit switch, by which the magnet 62 will be de-energized as a result of the opening movement of the door.

In securing the above results, I provide an electro-magnet 79, the winding of which is in series with the winding of the magnet 62 in the line 75. The electro-magnet 79 actuates a movable contact 80 which is connected with one of the shaft lines, as 34, by the line 81. Associated with the contact 80 is a fixed contact 82 connected with a shunt line 83, which in turn is connected with the line 75. Arranged in the line 75 are the fixed contacts 84 and 85 of a limit switch having a movable contact 86 which may be actuated by means of an arm 87 and a co-operating cam 88 carried by one of the door sections, ordinarily the upper door section. The limit switch mechanism is closed when the door is closed, and remains closed until the door has substantially completed its full opening movement.

Adjacent the opening switch 72 is a manually operative closing switch 89 having two fixed contacts. one of which 90 is electrically connected with the line 73, and the other 91 is electrically connected through the line 92 with the winding of the magnet 71, the cir\ cuit being completed through the lines 93, 54 and 30.

The lock switch mechanism is provided with a heavy metal housing secured in any desired manner to the guide rail structure.

The face of this housing presented toward the door is pierced to form a keeper opening as shown at 94. v

The bridge contacts 41 and 43 are provided with stems 95 and 96 slidably mounted respectively in the ittings 97 and 98. Springs 99 and 100 act against large heads 101 and 102 upon said stems to normally engage the bridge contacts with their co-operating fixed contacts. The heads 101 and 102 are located closely adjacent the keeper opening 94.

Carried by the upper door section 10a-11a within the metal angle frame of the door is an ordinary key-controlled lock mechanism indicated at 103, this mechanism being provided with the usual latch or bolt 104. The frame 12 is pierced to permit the projection of this bolt through the frame and through the keeper opening 94 intoengagement with the heads 101 and 102. By this construction the lock mechanism and its bolt, when projected or shot, receives support from the angle metal frame of the door so as to secure an effective locking action upon the upper door section, which, by reason of the flexible connections between same and the lower door section, will also prevent movement of this section as well as the upper section.

The key-controlled lock mechanism is located in the lower corner of the door frame so as to receive support from both the bottom and the side rail of the door frame.

The operation of the struct-ure above described is substantially as follows When it is not desired to open a door, the shaft switch mechanism adjacent each door will be open; the lock switch mechanism adjacent each door will beclosed; the magnets 62, 71 and 79 will be de-energized and the limit switch 84-87 will be closed. This limit switch may be located adjacent each door in a sha-ft, or a penthouse limit switch mechanism may be employed, such as is described in my co-pending application Serial No. 529,263.

When the parts are in this position, no current is being supplied to the shaft lines 33, 34 and 35. Consequently, no power can be applied to any of the motors 20 and 22 in the shaft.

When it is desired to have access from the car to any floor of the building, the car is brought to rest at that floor.

If the cam 29 be a xed cam it will, by engagement with the lever 24, disengage the ratchet'bar 25 from its co-operating ratchet bar 26 as a result of its engagement with the impact roller 27, the movement of the lever 24 imparting such movement of the pivotal arm 48 as toengage the movable contacts 45 and 47 with their co-operating fixed contacts and closel the shaft switch.

Since the lock switch mechanism is closed, this relation of parts would result in the closing of the circuit to the motors 20 and 22,

were. it not forthefact that the penthouse opemng switch ls'still open.

whim-1t is desiredl to open the door, the

operator presses the button of the opening switch 72. Since the limit switch is cl the actuation of this button will close a circuit through the lines 31 and 73, the contacts 74, 76 and 77, line 75, the contacts of the limit switch, the windings of the electro-magnets 7 94 and 62 and thelines 78 and 31, thus energizing the electro-magnets 62 and 79. The magnete62 when so energized causes engagement .of the movable contacts 57, 58 and 59 with windings of the electro-magnets 62 and 79,

the circuit being completed through the lines 78 and 32. Thls electro-magnet 79 is known as a holding magnet, the purpose of which is--to ensure continuity of the flow of current through the winding of the'electro-magnet 62 as a result lof the continued energizing of the magnet 79, which condition contlnues until the circuit to both windings is opened by the actuation of the limit switch as a result of the movement of the door itself; The cam 88 en aging the lever 87 effects this result as the oor approaches orv completes its full opening movement.

4As a result of this mode of operation, power may be applied to any door in a shaft by bringing the elevator vcar to the floor opening closed by that door and actuating the open: ing switch in the car or in kthe 'hall in the manner above described.

The operation of the closing switch is immaterial to the present invention,'it being merely necessary to state that even thou h the opening limit switch may be closed, t e actuation of the penthouse closing lswitch mechanism will not cause the electro-magnets 62 and 79 to be energized, since both the main push button circuit and the holding magnet circuit will be open at all times excepting when it is desired to apply opening power to Vthe motors.

The fore oing operation is necessary to an understandlng of the problems solved by the present invention. Itis obvious, with the conditions above described, that anyone having access to an elevator car can get access to any loor by merely bringing the car to that floor and actuating the opening switch mechanism 72. It is sometimes highly desirable, tov protect the contents of a floor or loft, that this opening of the'door be prevented, and that it be prevented without psibility of injury to the operator system as a whole.

To prevent the opening of the door, the lock switch mechanism herein described is resorted to. By means of this mechanism, it is not only possible to mechanically prevent anymovement of either door section, but the door operator system is made inoperative as to any door so located, so that, notwithstanding a car is brought to a floor and the opening switch 72 is actuated, even though the penthouse opening switch may be actuated, no power -fromthe shaft mains 33, 34 and 35 can be applied to the motols 20 and 22. lIt is desirable that the lock mechanism 103 be located on the floor side of the door, and when a wood panel metal sheathed construction of door is used, this lock mechanism is set into the panel. Its location ensures the protection of the greater portion of the lock by the inturned ilanges of the door frame 12. The lock, however, may be effectively used with metal sheathed doors. When the occupant of a floor or loft desires to prevent access thereto from the elevator car, he merely shoots the bolt of the lock mechanism 103 by means of akey, and as the bolt is projected or'shot, it passes through the opening 94 in the housing for the lock switch mechanism and, by engagement with the heads 101 and 102 of the stems of the bridge contacts 41 and 43, forces said contacts out of engagement with their cooperating ixed contacts and .thus interrupts the circuit from the shaft mains to the motors in a manner to make the shaft switch ineffective to close this circuit, even though the car cam be operative yin a manner to nor- `mally effect this result.

By the construction herein described, I am enabled to include in the door operator system a factor of safety, not only insofar as the unauthorized opening of any door is concerned, but against possible injury to the door structure and to the motors themselves if the opening of a door be attempted.

Whenever the bolt ,-104 is engaged with its keeper and the movable contacts of the` lock switch mechanism, lboth door sections are positively lockedagainst movement and energy cannot be impressedupon the motors 20 and 22. Even though the penthouse open.:V4

ing switch may be closed, the circuits to all of the motors in the shaft will be open, so that the only result will be that potential will be impressed upon the shaft mains. In fact, the lock switch mechanism is an effective safeguard against unauthorized entry upon any floor or loft in a building, irrespective of the type of elevator installation', which may be used, and this result is Secured through a control of the door operator motors anda mechanical locking'of the door sections by thesame key-controlled mechanism in a manner to prevent tampering with the mechanisms employed to control the lcircuits to said motors.

While it is preferable to utilize the lock switch mechanism to preclude any possibility of movement of either door section, it is obvious that, so far as the control of the circuit to-the operator motors 20 and 22 is concerned, said mechanism may be used upon either door section, but if used upon the lower door section, it is possible to raise the upper door section so that access might be had to a Hoor or loft across the upper edge of the closed lower section, although the weight of this section will make this diiicult.

It is not my intention to limit the invention to the precise details of construction and combination of parts shown in the accompanying drawings, it being apparent that such may be varied without departing from the spirit and scope of the invention.

Having described the invention, what I claim as new and desire to have protected by Letters Patent, is

1. An operator for counterbalanced elevator doors, embodying therein an electric motor adjacent a door in a shaft, flexible connections between the door sections, sheaves about which said connections pass, means whereby the power of said motor may be applied to said door sections, a lock for said door sections, a source of power, electrical mains in the shaft adj acent said door, branch lines leading from said mains to said motor, a normally open shaft switch mechanism controlling the circuit from said mains to said motor, means carried by an elevator car and operative upon said shaft switch mechanism, a pole changing switch mechanism whereby said mains may be connected with said source, a manually operative control for said pole changing switch mechanism, and a lock switch mechanism comprising normally engaged fixed and movable contacts connected in series with said shaft switch mechanism, a keeper plate adjacent said contacts and a key-controlled lock4 mechanism carried by one of the door sections and including a bolt co-operating with said keeper plate to prevent movement of the door sections and with said lock switch mechanism to interrupt the circuit to said motor independently of said shaft switch mechanism. f

2. An operator for counterbalanced elevator doors, embodying therein an electric motor adjacent a door in a shaft, flexible connections between the door sections, one of said door sections having an angle metal frame, sheaves about which saidconnections pass,

j a guide rail structure upon which said sections have movement, means whereby the power of said motor may be applied to said door sections, a lock for said vdoor sections a source of power, electrical mains in the shaft adjacent said door, branch lines leading from said mains to said motor, a normally open shaft switch mechanism controlling the circuit from said mains to said motor, means carried by an elevator car and operative upon said shaft switch mechalSm, a ple changing switch mechanism wherl?)I `SEICL mains may be connected with said source, a manually operative control for said pole changing switch mechanism, and a lock switch mechanism carried by said guide rail structure comprising normally engaged xed and movable contacts connected in series with said shaft switch mechanism, a keeper plate adjacent said contacts and a key-controlled lock mechanism carried by one of the door sections which has an opening in the frame thereof in alinement with theopening of said keeper plate and including a bolt adapted to pass through the opening in the door frame and co-operate with said keeper plate to prevent movement of the door sections and with said lock switch mechanism to interrupt the circuit to said motor independently of said shaft switch mechanism.

3. A11 operator for counterbalanced elevator doors, embodying therein an electric motor adjacent a door in a shaft, flexible connections between the door sections, sheaves about which said connections pass, means whereby the power of said motor may be applied to said door sections, a lock for said door sections, a source of power, electrical mains vin the shaft adjacent said door, branch lines leading from said mains to said motor, a normally open shaft switch mechanism controlling the circuit from said mains to said motor, means`carried by an elevator car and operative upon said shaft switch mechanism, a pole changing switch mechanism whereby said mains may be connected with said source, a manually operative control for said ole changing switch mechanism, and 'a ocl: switch mechanism comprising normally engaged fixed and movable contacts connected in series .with said shaft switch mechanism, a keeper plate adjacent said contacts and a key-controlled lock mechanism carried by the upper door section and including a bolt cooperating with said keeper plate to prevent movement of the door sections and with said lock switch mechanism to interrupt the circuit to said motor independently of said shaft switch mechanism.

4. An operator for counterbalanced elevator doors, embodying therein an electric motor adjacent a door in a shaft, flexible connections between the door sections, one of said door sections having an angle metal frame, sheaves about which said connections pass, a guide rail structure upon which said sections have movement, means whereby the power of said motor may be applied to said door sections, a lock for said door sections, a source of power, electrical mains in theshaft adjacent said door, branch lines' leading from said mains to said motor, a normally open lLevassa cent said contacts and a key-controlled lock tion which has an opening in mechanism carried by the u per door sece frame thereof in alinement with the openi of said keeper plate and including a bolt a apted to pass through the openin in the door frame and co-operate with sai keeper'plate to prevent v. movement of the door sections andwith said switch mechanism.

4:" trol for said polechanging switch mechamains in the shaft adjacent said' door branch lines leading from said mains to said motor, a normally open shaft switch mechanism controlling the circuit from .said mains to said motor, means carried by an elevator car and operative upon said shaft switchmechanism, a pole changing switch mecha nism whereby said mamsmay be connected with said source, a manually operative connism, and a lock switch mechanism comprising a heavy metal housing, the wall of which Y presented toward a door section has a' keeper guide iixture opening therein, normally engaged fixed and movable contacts mounted in said housing and connected in series with said shaft switch mechanism, stems'carried by said movable said door sections havin an angle metal frame, sheaves about whic said connections pass, a guide rail structure upon which said sectionshave movement, means whereby the power of said motor may be applied to said door sections, a lock for said door sections, a source of power, electricalmains in the shaft adjacent said door, branch lines leading' from said mains to said motor, a normally open shaft switch mechanism controlling the cicuit from said mains 'to said motor, means carried b an elevator car and operative upon said sha t switch mechanism, a pole changing switchmechanism whereby said mains may be connected with said source, a manually operative control for said pole changing switch mechanism, and a lock switch mechaism carried by saidguide rail structure comprising a heavy metal housing, the wall of which presented towarda door section' has a keeper opening therein, normally enaged fixed and movable contacts mounted 1n said housing and connected in series with said shaft switch mechanism, stems carried by' said movable contacts, enlarged heads upon said stems, a ide iixture for said stemss rings acting tween said guide fixture an said enlarged heads, said enlarged heads being positioned in alinement and adjacent thejkeeper opening in said housing and a key-controlled n lock mechanism carried by the upper door section which has an opening in the frame thereof in alinement with the opening in said housing and including a bolt adapted to pass through the opening in the door frame and co-operate with sald keeper opening in said housing to pre-v` vent movement of the door sections and with said movable contact stems to actuate said movable-contacts to-interrupt the circuit to said motor independently of said shaft A switch mechanism.

In witness whereof, I have hereunto aiiixed my signature, this 2nd day of December,

- RoBER'i1 s. PEELLE.

contacts, enlalged heads upon said stems, a A

or said stems, springs ctngf .I I

between said guide fixture and said enlar ed heads, said enlar alinement and a jacent the keeper opening in said housing and a key-controlled lock mechanism carried by one ofthe door sections and including a bolt cooperating with said'keeper opening in said housing to prevent movement of the door sections and with said mov- N able contact stems to 'actuate said movable contacts to interrupt the circuit to saidmotor independently of said shaft switch mecha- I nism.

6. NAn operator for counterbalanced eleva-.

heads being positione in tor adjacent a door 1n a shaft, flexible conv A nections between the door sections, one of 

